Sweep: Use Langchain to make the model call

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• [ ] 👍 Sweep Did Well
• [ ] 👎 Sweep Needs Improvement

  Description

  This pull request introduces the integration of Langchain for model invocation within the perf_review_ai package. It sets up necessary configurations and implements a model invoker function that utilizes Langchain's ChatOpenAI model for processing input text.

Summary

• Added config.py to set environment variables for Langchain integration, including LANGCHAIN_TRACING_V2, LANGCHAIN_ENDPOINT, LANGCHAIN_API_KEY, and LANGCHAIN_PROJECT.
• Created model_invoker.py which contains the invoke_model function. This function takes an input string, invokes the Langchain ChatOpenAI model, and returns the model's response.
• Initialized the perf_review_ai package by importing the config module in __init__.py.

Affected files and directories:

• myenv2/lib/python3.11/site-packages/perf_review_ai/__init__.py
• myenv2/lib/python3.11/site-packages/perf_review_ai/config.py
• myenv2/lib/python3.11/site-packages/perf_review_ai/model_invoker.py

Fixes #13.

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Rollback Files For Sweep

• [ ] Rollback changes to myenv2/lib/python3.11/site-packages/perf_review_ai/init.py
• [ ] Rollback changes to myenv2/lib/python3.11/site-packages/perf_review_ai/config.py
• [ ] Rollback changes to myenv2/lib/python3.11/site-packages/perf_review_ai/model_invoker.py

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Apply Sweep Rules to your PR?

• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.

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